IV. Magento--在Module中访问数据库

假设你已经在完成了系列文章中前面的部分。那么已经有了一个模型文件为model/Room.php，并且etc/config.xml文件的global内容如下:

       <global>
            <models>
                <hotel>
                    <class>Cartz_Hotel_Model</class>
                </hotel>
            </resources>
         </global>

I. 现在修改etc/config.xml为

        <global>
            <models>
                <hotel>
                    <class>Cartz_Hotel_Model</class>
                    <resourceModel>hotel_mysql4</resourceModel>
                </hotel>
                <hotel_mysql4>
                    <class>Cartz_Hotel_Model_Mysql4</class>
                    <entities>
                         <room>
                            <table>rooms</table>
                        </room>
                    </entities>
                </hotel_mysql4>
            </models>
            <resources>
                <hotel_setup>
                    <setup>
                        <module>Cartz_Hotel</module>
                    </setup>
                    <connection>
                        <use>core_setup</use>
                    </connection>
                </hotel_setup>
                <hotel_write>
                    <connection>
                        <use>core_write</use>
                    </connection>
                </hotel_write>
                <hotel_read>
                    <connection>
                        <use>core_read</use>
                    </connection>
                </hotel_read>
            </resources>
         </global>

II. 创建表结构和录入测试数据

    create table rooms(id int not null auto_increment, name varchar(100), primary key(id));
    insert into rooms values(1,'Royal Room');
    insert into rooms values(2,'Standard Room');

III. model/Room.php内容修改如下:

    <?php
    class Cartz_Hotel_Model_Room extends Mage_Core_Model_Abstract
    {
        protected function _construct()
        {
            $this->_init('hotel/room');
        }
    }
    ?>

IV. 新建文件model/Mysql4/Room.php

    <?php
    class Cartz_Hotel_Model_Mysql4_Room extends Mage_Core_Model_Mysql4_Abstract
    {
        protected function _construct()
        {
            $this->_init('hotel/room', 'id');
        }
    }
    ?>

V. 修改controllers/RoomController.php.

    <?php
    class Cartz_Hotel_RoomController extends Mage_Core_Controller_Front_Action{

        public function loadAction($id = null){
          $id= (int) $this->getRequest()->getParam('id', false);
          $roomObj = Mage::getModel('hotel/room');
          
          $room = $roomObj->load($id);
          $name = $room->getName();
          if(empty($name)) {
              echo "Not Existed Room.";
          } else {
             echo "Room Name : ".$name;
          }
        }
    }
    ?>

当在浏览器地址栏中输入:
    http://localhost/magento/index.php/hotel/room/load/id/1

你这是应该看到页面上输出字符串:
    Room Name :　Royal Room

这里还揭示了页面参数是如何传给Magento的Controller里的:
url上的id/1在action方法中用
    $this->getRequest()->getParam('id', false);
来获取.